Re: Oh my! Nostalgia!

Mar 20, 2007 1 Replies


Jim Thomps>


>> Oh my! Nostalgia!
>>
>> Stumbled onto this site...
>>
>>
formatting link

>>
>> I built the FM3 and the PAS2 when I was a kid ;-)
>>
>
>I built more mean stuff when I was a kid. An amplifier with several big
>horizontal flyback tubes in there etc. 900V on the plates, directly
>cascaded out of 230V grounded mains, sans transformer because that would
>have cost too much...
>
>Actually I still got that amp but a typical 120V circuit is too wimpy
>for it.

I built at least six different tube power amplifiers, starting with


6V6, then 6L6, then a variety of 6550, KT88 and similar.

...Jim Thompson


| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona Voice:(480)460-2350 | | | E-mail Address at Website Fax:(480)460-2142 | Brass Rat | | http://www.analog-innovations.com | 1962 | America: Land of the Free, Because of the Brave

Mine was with PL509 tubes. Those are color TV flyback drivers rated at

30W plate dissipation. But you could push them up to 70-80W dissipation before the plates went from cherry-red to orange.

Of course having to always watch the plates and make sure they don't go too far into an orange glow was a hassle. So, I built the gorilla of all amplifiers with two of these puppies:

5kV on the plates. Those tubes can easily pack away 500W of plate dissipation without a whiff of redness. Each.
Regards, Joerg http://www.analogconsultants.com

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